Warm white is the most popular shade of white LED lights mainly because they are closely matched to the old style incandescent lighting. It’s classic look is due to the hint of yellow mixed with white, which emits the candlelit hue that is so popular.
Cool white is sometimes confused with pure white but in truth, cool white is not a pure white color. A touch of blue is mixed in with the white to create a cooler (less warm white) look.
Pure white is exactly as the name implies- they are purely white, no other colors are incorporated to soften or harden the color.